Reordering and Disordering of the Copper Hexadecafluorophthalocyanine (F16CuPc) Monolayer by K Doping

Potassium (K)-induced structural and electronic modifications in the copper hexadecafluorophthalocyanine (F16CuPc) monolayer were investigated by scanning tunneling microscopy and photoemission spectroscopy. The adsorption of K was found to cause a rearrangement of the molecular ordering in the F16CuPc monolayer, depending on the K concentration. For doping with one to two K atoms per molecule, K adsorbs in the intermolecular region adjacent to the aza-bridging nitrogen, forming new ordered phases. A further increase in K coverage causes the on-top adsorption of K, which in turn disorders the monolayer. The photoemission spectrum of the K-doped phase exhibits a small density of states immediately below the Fermi level. Both the formation of the new states and the K-induced structural ordering or disordering of the molecular layer may be responsible for the reported alteration of the macroscopic electronic conductivity.

[1]  M. Sasaki,et al.  Well-ordered monolayers of alkali-doped coronene and picene: molecular arrangements and electronic structures. , 2014, The Journal of chemical physics.

[2]  D. J. Mowbray,et al.  Understanding energy-level alignment in donor-acceptor/metal interfaces from core-level shifts. , 2013, ACS nano.

[3]  P. Gambardella,et al.  Site- and orbital-dependent charge donation and spin manipulation in electron-doped metal phthalocyanines. , 2013, Nature materials.

[4]  K Nilson,et al.  Potassium-intercalated H2Pc films: alkali-induced electronic and geometrical modifications. , 2012, The Journal of chemical physics.

[5]  M. Knupfer,et al.  Initial growth at the F16CoPc/Ag(111) interface , 2011 .

[6]  M. Knupfer,et al.  Electronic properties of potassium-doped FePc , 2010 .

[7]  N. Koch,et al.  Site-specific geometric and electronic relaxations at organic-metal interfaces. , 2010, Physical review letters.

[8]  S. Berner,et al.  Rubidium Doped Metal-Free Phthalocyanine Monolayer Structures on Au(111) , 2010 .

[9]  Y. Maniwa,et al.  Superconductivity in alkali-metal-doped picene , 2010, Nature.

[10]  Wei Chen,et al.  Scanning tunneling microscopy investigation of self-assembled CuPc/F16CuPc binary superstructures on graphite. , 2010, Langmuir : the ACS journal of surfaces and colloids.

[11]  A. Goldoni,et al.  Phase separation in potassium-doped ZnPc thin films. , 2007, The Journal of chemical physics.

[12]  Y. Wakayama.  Assembly Process and Epitaxy of the F16CuPc Monolayer on Cu(111) , 2007 .

[13]  A. Morpurgo,et al.  Potassium Phthalocyanine, KPc: one-dimensional molecular stacks bridged by K+ ions. , 2006, Inorganic chemistry.

[14]  M. Knupfer,et al.  Electronic properties of potassium-doped CuPc , 2005 .

[15]  A. Morpurgo,et al.  Correlation between molecular orbitals and doping dependence of the electrical conductivity in electron-doped metal-phthalocyanine compounds. , 2005, Journal of the American Chemical Society.

[16]  Jörg Fink,et al.  Fluorination of copper phthalocyanines: Electronic structure and interface properties , 2003 .

[17]  R. Courths,et al.  Electronic band structure of ordered Cu 3 Au: An angle-resolved photoemission study along the [001] direction , 1999 .

[18]  Zhenan Bao,et al.  New Air-Stable n-Channel Organic Thin Film Transistors , 1998 .

[19]  Hung,et al.  Order-disorder transition at the (001) surface of a 3 at. %-Au-rich Cu3Au crystal. , 1995, Physical review. B, Condensed matter.